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The oxidation behavior of some Ni-Cr-Al alloys at high temperatures

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Abstract

Oxidation of ternary Ni-Cr-Al alloys containing different Cr/Al ratios has been studied in the temperature range 800° to 1300°C. Most of the studies were performed in 1 atm oxygen or air, but the oxygen pressure dependence for one of the alloys was also investigated. The experimental methods included thermogravimetric measurements of oxidation rates and studies on reacted specimens by means of X-ray diffraction, metallographic techniques, electron microprobe analysis, and electron microscopy. In general, the oxidation rates decrease faster with time than that for an ideal parabolic behavior. The major reaction products were NiO, Cr2O3,α-Al2O3, and Ni(Cr,Al)2O4. The relative amounts of these were a function of composition, temperature, oxygen pressure, and reaction time. The Ni-9Cr-6Al alloy has the best oxidation resistance due to the formation ofα-Al2O3 at all temperatures investigated. The oxidation mechanism of the alloy is discussed.

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Authors and Affiliations

  1. Central Institute for Industrial Research, Oslo, Norway

    Ingard A. Kvernes (Senior Scientist, Division of Metallurgy) & Per Kofstad (Head-Department of Materials Research)

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  1. Ingard A. Kvernes
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  2. Per Kofstad
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Kvernes, I.A., Kofstad, P. The oxidation behavior of some Ni-Cr-Al alloys at high temperatures. Metall Trans 3, 1511–1519 (1972). https://doi.org/10.1007/BF02643040

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  • DOI: https://doi.org/10.1007/BF02643040

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